低炭素アルミキルド鋼における炭化物・窒化物の析出の熱電能測定による研究

概要

論文の詳細を見る
Changes in thermoelectric power and electrical resistivity during 10 min/20℃ isochronal annealing were observed in several quenched or cold rolled specimens of low carbon aluminum-killed steel. Annealing stages corresponding to the precipitation of metastable carbide, cementite, iron-nitride and aluminum-nitride could be followed by the thermoelectric power measurement with fairly good accuracy. In the quench-aging of the steel, a weak unidentified peak was detected around 380℃, which could not be found by the resistivity measurement. From a discussion on the abnormally high value of the ratio of thermoelectric power increment to resistivity decrement (-dS/dρ), it was postulated that the aging on heating from room temperature to ∿100℃ immediately after cold rolling (70% reduction) was associated with dissociation of point defectnitrogen complexes to form AlN molecules. The value of (-dS/dρ) for the precipitation of iron-nitrides was estimated to be -1.8V・Ω^<-1>cm^<-1> deg^<-1>. The 400-480℃ stage in the isochronal annealing of the cold rolled specimen could be identified as due to pre-precipitation clustering of AlN, since the (-dS/dρ)-value was approximately the same as that of the precipitation of hexagonal AlN (-0.47 V・Ω^<-1>cm^<-1>deg^<-1>).
社団法人日本鉄鋼協会の論文
1977-05-01